bowser vs soaker

bowser

noun
  • A mobile water tank deployed to distribute fresh water in emergency situations where the normal system of piped distribution has broken down or is insufficient. 

  • A buffoon or imbecile. 

  • A road vehicle (often a trailer) for the transport of liquid fuel, particularly aviation fuel at an airfield. 

  • A fuel metering/delivery pump at a filling station. 

soaker

noun
  • A kind of perforated hose used to distribute drips of water to a number of plants. 

  • The experience of stepping in a deep puddle and having one's foot become completely engulfed in water. 

  • One who, or that which, soaks. 

  • A kind of knitted woollen diaper. 

  • A person suffering from alcoholism. 

  • A mixture of grains softened in water which is added to bread dough. 

How often have the words bowser and soaker occurred in a corpus of books? (source: Google Ngram Viewer )